Remove Nerves.Port.cmd/3 usage for quick commands

Treat artifact archives non-generically

Remove deprecated since 2018 artifact_url support

Push file download logic down to HTTPClient

v1.13.2 release

Add :nerves_bootstrap back to fix compiler error

Stream artifact downloads to files rather than in-memory

Rewrite proxy code to remove side effects

Simplify download progress handling

Remove unneeded Application.ensure_all_started

Be more precise with HTTPClient options

Remove HTTPClient GenServer; use Mimic for tests

http_client: fix options spec to what's actually used

http_client: remove unneeded url

Remove need to keep Nerves Bootstrap dependency loaded